STMicroelectronics 12 V, 150 mA non-isolated buck converter using VIPer™ Plus - VIPER06XS STEVAL-ISA115V1 User Manuals

Table of Contents

• Figure 1. STEVAL- ISA115V1 demonstration board

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• 1 Adapter features

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  • Table 1. Electrical specifications

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• 2 Circuit description

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  • Figure 2. Application schematic

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• 3 Bill of material

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  • Table 2. Bill of material

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• 4 Layout

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  • Figure 3. Layout (top)

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  • Figure 4. Layout (bottom)

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• 5 Testing the board

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  • 5.1 Typical waveforms

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    • Figure 5. Waveforms at VIN = 115 VAC, full load

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    • Figure 6. Waveforms at VIN = 230VAC, full load

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    • Figure 7. Waveforms at VIN = 80 VAC, full load

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    • Figure 8. Waveforms at VIN = 265 VAC, full load

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  • 5.2 Line/load regulation and output voltage ripple

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    • Figure 9. Line regulation

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    • Figure 10. Load regulation

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    • Figure 11. Output voltage ripple at 115 VAC, full load

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    • Figure 12. Output voltage ripple 230 VAC, full load

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  • 5.3 Burst mode and output voltage ripple

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    • Figure 13. Output voltage ripple at 115 VAC, no load

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    • Figure 14. Output voltage ripple at 230 VAC, no load

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  • 5.4 Efficiency

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    • Figure 15. Active mode efficiency vs. VIN and comparison with CoC4 and DOE

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  • 5.5 Light load performance

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    • Table 3. No load input power

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    • Table 4. Energy consumption criteria for no load

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    • Figure 16. PIN vs. VIN @ no load and light load

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    • Figure 17. Efficiency @ PIN = 1 W

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    • Figure 18. PIN @ POUT = 0.25 W

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• 6 Functional check

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  • 6.1 Startup

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    • Figure 19. Startup at VIN = 115 VAC, full load

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    • Figure 20. Startup at VIN = 115 VAC, full load, zoom

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    • Figure 21. Startup at VIN = 230 VAC, full load

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    • Figure 22. Startup at VIN = 230 VAC, full load, zoom

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  • 6.2 Overload protection

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    • Figure 23. Output short-circuit applied: OLP tripping

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    • Figure 24. Output short-circuit maintained: OLP steady-state

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    • Figure 25. Output short-circuit maintained: OLP steady-state (zoom)

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    • Figure 26. Output short-circuit removal and converter restart

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  • 6.3 Feedback loop failure protection

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    • Figure 27. Feedback loop failure protection: tripping

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    • Figure 28. Feedback loop failure protection: steady-state

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    • Figure 29. Feedback loop failure protection: steady-state zoom

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    • Figure 30. Feedback loop failure protection: converter restart

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• 7 Feedback loop calculation guidelines

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  • 7.1 Transfer function

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    • Figure 31. Control loop block diagram

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  • 7.2 Compensation procedure for a DCM buck

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• 8 Thermal measurements

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  • Figure 32. Thermal measurement @ VIN = 80 VAC, full load (130 mA) Rbl = 8.2 kohm

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  • Figure 33. Thermal measurement @ VIN = 115 VAC, full load (130 mA) Rbl = 8.2 kohm

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  • Figure 34. Thermal measurement @ VIN = 230 VAC, full load (130 mA) Rbl = 8.2 kohm

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  • Figure 35. Thermal measurement @ VIN = 265 VAC, full load (130 mA) Rbl = 8.2 kohm

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• 9 EMI measurements

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  • Figure 36. Average measurement at full load, 115 VAC

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  • Figure 37. Average measurement at full load, 230 VAC

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• Appendix A Test equipment and measurement of efficiency and light load performance

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  • Figure 38. Connections of the UUT to the wattmeter for power measurements

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  • A.1 Measuring input power

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    • Figure 39. Switch in position 1 - setting for standby measurements

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    • Figure 40. Switch in position 2 - setting for efficiency measurements

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• 10 References

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• Revision history

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  • Table 5. Document revision history

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